TORONTO (AP) Gunfire broke out and a stampede ensued as fans celebrated at a rally Monday for the NBA champion Raptors, leaving four people shot and thousands fleeing less than a block from where the players and Canadian Prime Minister Justin Trudeau sat on stage.

Three people were arrested and two guns were recovered, Toronto police said, and investigators did not discuss a possible motive for the attack.

Droves of Raptors fans ran from the shooting in a stampede from the City Hall square, which was packed with tens of thousands of people. Earlier Monday, well over a million fans packed downtown Toronto for a parade for the Raptors, raising concerns about safety and overcrowding as the city celebrated its first major sports title in more than a quarter-century.